s = input()

if (s == "RRR"):
    print(3)
elif (s[0] == s[1] == 'R' or s[1] == s[2] == 'R'):
    print(2)
elif (s[0] == 'R' or s[1] == 'R' or s[2] == 'R'):
    print(1)
else:
    print(0) s = input() s input() input if (s == "RRR"):
    print(3)
elif (s[0] == s[1] == 'R' or s[1] == s[2] == 'R'):
    print(2)
elif (s[0] == 'R' or s[1] == 'R' or s[2] == 'R'):
    print(1)
else:
    print(0) s == "RRR" s "RRR" print(3) print 3 elif (s[0] == s[1] == 'R' or s[1] == s[2] == 'R'):
    print(2) s[0] == s[1] == 'R' or s[1] == s[2] == 'R' s[0] == s[1] == 'R' s[0] == s[1] s[0] s 0 s[1] s 1 'R' s[1] == s[2] == 'R' s[1] == s[2] s[1] s 1 s[2] s 2 'R' print(2) print 2 elif (s[0] == 'R' or s[1] == 'R' or s[2] == 'R'):
    print(1) s[0] == 'R' or s[1] == 'R' or s[2] == 'R' s[0] == 'R' or s[1] == 'R' s[0] == 'R' s[0] s 0 'R' s[1] == 'R' s[1] s 1 'R' s[2] == 'R' s[2] s 2 'R' print(1) print 1 print(0) print 0 s = input() input() s
s = input()

if (s == "RRR"):
    print(3)
elif (s[0] == s[1] == 'R' or s[1] == s[2] == 'R'):
    print(2)
elif (s[0] == 'R' or s[1] == 'R' or s[2] == 'R'):
    print(1)
else:
    print(0)
